By contrast, photovoltaic solar power systems, mostly used on home rooftops, let light interact directly with semiconductor materials to generate power.
安装在住宅屋顶的太阳能光伏系统则与其相反，它让光线直接照射半导体材料以产生动力。
What's more, with the light power obviously intensifying and tunnel noticeably increasing, fiber nonlinearities have become a mainly important limitation imposing on systems.
但是，随着光纤中信道数的增多、光功率的增加，已使光纤非线性效应成为影响系统性能的主要因素。
As the existing great power consumption of empty-load or light-load, the bipolar PWM control can be applied only in small or middle power servo control systems.
在轻载或空载时由于存在大的功率损耗，双极性PWM控制只能被应用于中、小功率伺服控制系统。
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